Too many way to use this word . Please check this url > http://dictionary.cambridge.org/dictionary/english/might

Se puede estar utilizar la palabra “might” como un subjuntivo en español. Espero que esto le ayude.

A common example would be: Question:"Are you going to go to the concert?" Answer: "I might, but I have not decided yet". A more old-fashioned example. You are at a social event and don't know anyone. You might say to a group of people "Might I join you?" I am not going to answer the door at this time of night - you never know who it might be"